Science

A standard shortcut, used since the 1970s, hides a magneto-optic effect in ordinary glass fiber

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 11/11/2026, 13:40:24 UTC.

Briefings

Researchers at the University of the Witwatersrand in Johannesburg, South Africa, discovered that a standard shortcut for describing light in optical fiber actually hides a magneto-optic effect. A magnet positioned beside the fiber, rather than along it, can alter the light's path. This finding challenges the long-standing assumption that the shortcut is perfectly accurate for all conditions.

Key points

• Engineers at the University of the Witwatersrand in Johannesburg, South Africa, demonstrated that a magnet placed beside multimode fiber can change light traveling inside.
• The shortcut used for over 50 years in optical fiber descriptions is now shown to contain a real, small effect that can be manipulated by an external magnet.

Context

This discovery challenges the long-standing assumption that the shortcut used for over 50 years in optical fiber descriptions is perfectly accurate for all conditions. The finding matters because it reveals a previously overlooked physical phenomenon that could impact fiber engineering and light transmission reliability.

Limitations

The evidence is limited to a single study by researchers at the University of the Witwatersrand in Johannesburg, South Africa. The specific conditions under which the magnet's effect was observed are not detailed, and the study does not provide broader validation or long-term impact data.

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